⎝⎛星力捕鱼⎞⎠

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Industry Information
Flow measurement in smart target flowmeter applications
2012-2-24 9:18:30

采用了最新型电容式力传感器作为测量和敏感传递元件,同时应用了最新数字技术和微电子技术,是一款适用于高粘度、低雷诺数及含有微小颗粒的流体和气体测量的智能流量计。 The target type intelligent flowmeter uses the latest capacitive force sensor as a measuring and sensitive transmission element, and applies the latest digital technology and microelectronics technology. It is a high viscosity, low Reynolds number, and fluid and gas containing micro particles. Smart flow meter for measurement. The use of capacitive force sensors is the key to the product's true high accuracy and stability. The target type intelligent flowmeter has the characteristics of no moving parts such as traditional orifice plates and vortex flowmeters, and has measurement accuracy comparable to that of volumetric flowmeters, plus its unique anti-interference and anti-impurity properties. It can replace conventional flow meters and conventional fluid flow measurement, and has very good application value, especially in difficult working conditions such as high viscosity, easy jamming, high temperature, high pressure, and strong corrosion.
The new generation of intelligent target type flowmeter integrates flow, temperature and pressure detection functions. It adopts advanced single-chip microcomputer technology and capacitive force sensor. The product has no moving parts, has strong anti-vibration, impurities, and interference ability. It has simple operation and installation. Easy, maintenance-free, fault self-test, low running cost and other features. It has been widely used in the measurement of the following media, which has solved the difficult flow measurement in the industry for many years. Such as semi-water gas, coke oven gas measurement, heavy oil, residual oil measurement, asphalt, liquid paraffin, toluene, sulfuric acid, natural gas, methane chloride, flue gas, chlorine gas, sewage, purified water, and other special media. Working principle When the medium flows in the measuring tube, due to its own kinetic energy and pressure difference between the target plate, the force on the target plate is generated, causing the target plate to generate a small amount of displacement, and the magnitude of its force is the square of the flow velocity of the medium It is proportional to the force received by the target plate and transmitted through the target rod to cause a small change in the elastic body of the sensor, thereby breaking the bridge balance composed of chip capacitance. Generate a voltage signal corresponding to the force of the flow on the target: The flow is proportional to the square of the voltage generated by the bridge due to the characteristics of the flow of the fluid.
The target type intelligent flowmeter has been widely used in flow measurement in various fields such as steel, petroleum, natural gas, electric power, papermaking, chemical industry, energy, food, environmental protection and other fields.



于六十年****始应用于工业流量测量,主要用于解决高粘度、低雷诺数流体的流量测量,先后经历了气动表和电动表两大发展阶段,智能靶式流量计是在原有应变片式靶式流量计测量原理的基础上,采用了新形式的传感器。 The target type intelligent flowmeter has been used in industrial flow measurement for sixty years. It is mainly used to solve the flow measurement of high viscosity and low Reynolds number fluids. It has experienced two development stages of pneumatic and electric meters. Based on the measuring principle of the original strain gauge target flowmeter, the new type of flowmeter uses a new type of sensor. The use of new sensors is the key to the true realization of high precision and stability of this new product. It has completely changed the original strain gauge target type flowmeter with large temperature drift, poor resistance to overload (shock), and various defects such as static sealing points. Not only does it take advantage of the original technical advantages of the target type flowmeter, but also has a measurement accuracy comparable to that of the volumetric flowmeter, plus its unique anti-interference and anti-impurity performance, in addition to replacing the conventional flowmeter can measure Flow measurement problems, especially in small flow, high viscosity, easy to set and easy to plug, high temperature, low temperature, strong corrosion, strong vibration and other difficult to measure flow conditions have good adaptability. Has been widely used in metallurgy, petroleum, chemical, energy, food, environmental protection and other fields of flow measurement.

Typical applications target flow meters are widely used in:
Gas: gas, air, hydrogen, natural gas, nitrogen, liquefied petroleum gas, hydrogen peroxide, flue gas, methane, butane, chlorine, etc.
Liquids: heavy oil, paraffin, asphalt, sulfuric acid, cooking oil, residue oil, acetone, diesel, mine water, detergent, soy sauce, gasoline, silicone oil,
Syrup, solvent, perfume, seawater, aviation kerosene, soap ketone, glucose, canolaic acid, saline, paste, ink, coolant,
Glycol, mineral oil, liquid sugar, hydrochloric acid, automotive coatings, resin, butter, vegetable oil, liquid oxygen, shampoo, toothpaste, gel,
Fuel, milk, bleach, conditioner, soda, additive, cleaning agent, alkaline, ammonia, marine oil, chemical reagent, kerosene,
Glycerin, dye, water, nitric acid, high boiling point organic solution, lard, alcohol, oil, ethylene, polypropylene, methylbenzyl, etc.
Steam: Superheated steam, saturated steam.

I. Principles and Characteristics
Structure
主要由测量管(外壳)、新型传感器(含阻流元件)、积算显示和输出部分组成。 The intelligent target type flowmeter is mainly composed of a measuring tube (housing), a new type of sensor (including a blocking element), an integrated display and an output part. According to different media and working conditions, suitable sensors must be selected. Therefore, users provide accurate measurement objects and parameters. Manufacturers choose the appropriate sensors is the key to whether the product can be accurately measured.
2. Working principle: When the medium flows in the measuring tube, the pressure difference caused by its own kinetic energy passing through the blocking member (target flow meter), and it has a force on the blocking member. The square of the velocity is proportional to the square of the velocity, and it is expressed mathematically as follows:
F = CdAρ · V2 / 2
In the formula: F——the acting force of the choke (kg)
Cd-object resistance coefficient
A——Axial projection area of the choke on the measuring tube (mm2)
ρ——Media density under working conditions (kg / m3)
V——average flow velocity of the medium in the measuring tube (m / s)
The force F received by the choke (target) is transmitted to the sensor via a rigidly connected transmission (stem), and the sensor generates a voltage signal output:
V = KF
In the formula: V——voltage of the sensor output (mV), K——proportional constant,
F——force acting on the choke (target) (kg)
Therefore, after the voltage signal is pre-amplified, AD converted, and processed by the computer, the corresponding instantaneous flow rate and cumulative total can be obtained.
Product features
· The whole instrument structure is sturdy without moving parts, plug-in structure, easy to disassemble;
· Can choose a variety of anti-corrosion and high and low temperature resistant materials (such as Hastelloy, titanium, etc.);
· The sensor is not in contact with the measured medium, there is no wear and tear on parts, and it is safe and reliable to use;
· Dry calibration method can be used on site, that is, weight hanging method. Press the button to complete the calibration;
· Various installation methods to choose from, such as online plug-in, low installation cost;
With integrated temperature and pressure compensation, direct output quality or standard square;
With optional small signal removal, non-linear correction, and filtering time;
· It can accurately measure the gas and liquid flow under various normal temperature, high temperature of 400 degrees, and low temperature of -200 degrees;
· High sensitivity, can measure ultra-small flow, its measurable low flow rate is 0.8m / s, wide measurement range, up to 1:30;
· Accurate measurement, accuracy can reach 0.2%;
· Good repeatability, generally 0.05% ~ 0.08%, fast measurement;
· Small pressure loss, only about 1/2 △ P of standard orifice plate;
· Excellent anti-interference and anti-impurity capabilities;
· The range can be changed according to the actual needs;
Low-power battery on-site display, which can directly read the displayed value online, and the display can simultaneously read the instantaneous and cumulative flow;
· Simple and convenient installation and easy maintenance;
· Various output forms, can transmit various parameters remotely;
· Strong vibration resistance, pulsating flow can be measured within a certain range.